Means for lubricating and cooling a submerged and insulated electric motor



July 29 1924.

R. LONGUE MEANS FOR LUBRICATING AND COOLING A SUBMERGED AND INSULATED ELECTRIC MOTOR la-Ill 2 Filed March 7.

Patented July 29, .1924.

UNITED STATES PATENT OFFICE.

RENE Lotions, or PANTIN, FRANCE.

MEANS FOR LUBRICA'I'ING AND COOLING A SUBMEIRIGED AND IN SULATED ELECTRIC moron.

Application filed March 7, 1921. Serial No. 450,361.

T all whom it may concern Be it known that I, Rani. LONGUE, citizen of the French Republic, residing at Pantiu, Seine, France, have invented certain new and useful Improvements in a Means for Lubricating and Cooling a Submerged and Insulated Electric Motor (for which'I have filed an application in France March 4, 1020, Patent No. 511,071), of which the following is a specification. For the purpose of electrically and physically insulating an electric motor from surrounding media, it has been proposed to encase the latter in an insulating body of high specific heat, and contained in an absolutely tight casing. In order, during operation of the motor, to permit the increase of the ca pacityof the casing when the insulating body (oil, for example) expands by'reason no of the heat, use is made of pressure counterbalancing members formed of a flexible and deformable diaphragm and constituting a part of said casing. These arrangements are defective. In fact, the diaphragm which forms the separating surface between the expansible insulating body and the surrounding medium is mechanically attached to the casing of which it forms a wall, so that its movements are limited either by said v attachment or by the deformation of the diaphragmo In any case the presence of said diaphragm introduces a heterogeneous element of certain characteristics and hence interferes with the ressure balancing, which 86 to be exact, should he purely hydrostatic.

V The purpose of the present invention is to v effect an exact balance between the pressure revailing inside and outside of the casing; or this purpose all mechanical elements are 40 omitted from a certain surface between the- V 80 erably enclosed in separate tight chambers,

each of which is connected with the surrounding medium in the same manner and for the same purpose as previously indicated.

For this purpose each device adapted to l6 balance the pressures of the oil and of th surrounding liquid is composed of two similar tight reservoirs placed at the same level, one of which communicates by its upper art withthe chamber containing the oilan b its lower part with the other reservoir whic 1 is open to the surrounding liquid at its up per part, the plane ofcontact between the surrounding liquid and the oil is preferably p ane containing the rotor axis, while the horizontal section of the reservoirs is slitticiently large so that the variations of the volume of the .oils are transferred or removed by slight drops in level from the contalct plane of the surrounding liquid and the o1 t exemplary embodiment of the inventlon is illustrated in the accompanying draw- Fig. 1 is a plan view artly in horizontal central section onthe ines 1-1 of Figs. 2 and 3,

Fig. 2 is a transverse sectional viewon line approximately. aligned with a horizontal On the other hand, in order to lubricate the parts subject to friction, the bearings 3, forming the supports for the ends of the shaft 2 of the rotor, are placed in lubricating oil enclosed in two tight zones 4" and 4-".

Two stuffing boxes 5 ermit the passage of I the shaft 2 from the closed chamber 1 0011-: 'tainingthe insulating oil into the chambers 4 and? containing the oil for lubricating the bearings 3, while separating the two oils. If there is only a single shaft end, a stuffing box 6 permits its passage therefrom; where two shaft ends are used, another stuffing box is provided at the opposite end.

The tight lubricating oil chambers com municate at their upper part with a tight reservoir 8 through conducting pipes 9 and 10, this reservoir 8 being-in turn connected by another pipe 11 to a similar reservoir 12. mounted in alignment to the first reservoir with respect to the horizontal plane containing the axis of the rotor. The reservoir 12 receives water or other liquid forming the surrounding medium through the iubricating iiquid and the surrounding .inlet'13. l'wo similar reservoirs 14 and 15 1 liquid being in the vertical part of the said serve as balancing members for the insulatcommon pipe. ing oil,'the casing 1, which contains it, com- In a submersible electric motor, a casmunicatingl with the reservoir 14 by the pipe ing adaptedto contain a motor and filled 16, while the reservoir 14 communicates with with an insulating liquid, reservoirs located the reservoir 15 through the pipe 17. .The on bdth sides 'of-the casing, a surrounding inlet. 18 permits filling of the reservoir 15 liquid 'in one of saidreserivolrs a pipe conwith liquid surrounding medium. necting the upper part of the casing with These reservoirs are arranged so that the that ofone of said reservoirs, another pipe contact-level M-M of the oil and the water' connecting the lower'part of the first reserq in the reservoirs 8 and 14, is ina horizontal voir with that of the second reservoir, this plane passing through the axis of the rotor, latter reservoir openlng at its upper part on at'ordmary temperature, so as to obtain a the-surrounding liquid, the plane of juncbetter balancing effect. ture' between the insulating iquid and the in addition, the horizontal section of the surrounding liquid being in the first reser reservoirs is sufliciently large so that. the voir and passing approximately through the variations in thevolume ofthe oils is transaxis of the rotor. j initted by very slight drops in level from v i. In a submersible electric niotor,a casthe plane of contact with the surrounding ing adapted to contain a motor and filled liquid. ,4 with an insulating liquid, reservoirs located Having now fully described the invention on both sides of'the casing, a surroundingwhat is claimed as new "and'desired to be liquid in one of the reservoirs a pipe consecured by Letters Patent isz' nectin the upper part of the casing with 1. In a submersible electric motor, a 0215- that 0 one of said reservoirs, another pipe ing adapted to contain a motor and filled connecting the lower part of the first reser- "with an insulating liquid, a surrounding voir with that of the second reservoir, this liquid a conducting pipe terminating at one latter reservoir opening at its upper part on of its ends at the upper part of the casing, the surrounding liquid, the plane of juncture the said pipe having a vertical portion and between the insulating liquid and the suropening at its other end on the sum Grinding rounding liquid heing' in the first reservoir liquid, the plane of junction hetween the and passing approximately through the axis insulating liquid and the surrounding liquid of the rotor, hearings for the shaft of'the. being in the vertical part of the pipe. motor, a casing enclosing each bearing and 2. In a submersible electric motor, a casfilled with lubricating liquid, twoadditional ing adapted to contain amotor and filled reservoirs located on the respective sides with an insulating liquid, a surrounding of the casing, a pipe connecting the upper liquid a-conducting pipe terminating at one part of one bearing casing with one or said of its ends at the upper part of the casing, last mentioned reservoirs, another pipe conthe said conductingpipe havin a vertical mating the lower part of said last mentioned portion, and opening at its ot ierend on reservoir with the other of said last menthe surrounding liquid, the plane of junction tioned reservoirs, this other reservoir 0 enbetween the insulating liquid and the suring at its upper part on the surroun ing rounding liquid being in the vertical part fli aid, the plane of juncture between the of the pipe, bearings for the shaft of the la ricating liquid and the surroundin motor, a casing containing each bearing and liquid being in the first reservoir, and said filled with lubricatingliquid, a common pipe plane passing approximately through the having a vertical part, and open at its lower axis of therotlorf end on the surrounding liquid, other pi es In testimony whereof l have signed my connecting the upper part of each bearing name :tothis specification. casing with the upper ends of the said common pipe, the plane of junction between the RENE LUNGUE. 

